Although ranked globally secure (G4) in the NatureServe database (2009), Dirca palustris is recognized as imperiled (S2) and critically imperiled (S1) in Florida and North Dakota, respectively, where the southernmost and northernmost populations occur.
Noteworthy phenotypic differentiation of populations within the accepted range for Dirca palustris has been illustrated already by Floden and Mayfield (2006) and Peterson et al.
Our goal was to test the hypothesis that gene flow among populations of Dirca palustris was historically limited, and not the product of more recent fragmentation, by characterizing phenotypic and genetic variation within and among five natural populations and relating the observed variation to the environment and geography.
Ramsewak, R.S., Nair, M.G., DeWitt, D.L., Mattson, W.G., Zasada, J.: Phenolic Glycosides from Dirca palustris
Intervascular pit pairs in woods of Gnidia caffra, Dirca palustris, and two species of Pimelea were observed with both light and scanning electron microscopy.
Specifically, it provides a characterization of pits in Gnidia caffra (Meisn.) Gilg, Dirca palustris L., and two species of Pimelea with emphases on the presence or absence of a torus, the outline of the pit apertures, and presence or absence of vestures.
The prevailing underwoods were: Dirca palustris
(moosewood), Acer spicatum (mountain maple), Viburnum lantanoides (hobblebush), and frequently Taxus baccata, var.